Bathroom floor plan 9 sqm

A tendency is already becoming apparent

However, I wonder whether widening the shower and the resulting reduction in the bathtub would bring advantages?

Also, our general contractor planned the shower partition wall with only 10 cm - so probably made of drywall.
Isn't the wall usually built with aerated concrete?

A 1m wide shower is completely sufficient. We also have the meter and can even comfortably shower together.
I'm a bit uncertain about the depth. We have 1.40m and that's rather tight. But we don't splash around wildly. It works. Yours looks even tighter. What do you have?

I would consider placing the toilet next to the sink to have a nice open space in the middle where you can step to the window (which I would place centrally) and next to the bathtub to have a cabinet for the wine glass... or what is the "1"?

While we're at it, what does the rest of the house look like so far?

1m as shower width is more than enough. I wouldn't shorten the tub for that.

Alternatively, the partition wall could of course also be made of glass.
Disadvantage: needs cleaning (maybe better if frosted)
Advantage: daylight in the shower, only 1cm thick, bathroom overall feels more spacious, airier.

Regarding the floor plans, are you allowed to move/resize the bathroom window in the terraced house? At least that's different between the red and the green plan.

Is a garage going to be added there or why does the living room on the left side of the plan have no window?